We have studied the electric and magnetotransport properties of Co//Al₂O₃/CoI/Al₂O₃//(CoorCu) tunnel double junctions, in which the intermediate CoI layer is either granular or percolated clusters and the top electrode is either Co or Cu. In granular junctions, spin-dependent tunneling with Coulomb-blockade effect was observed. The temperature dependence of the resistance can be attributed to two conduction channels in parallel between electrodes via granules and via other channels such as metallic impurities in the insulating layer. Voltage and temperature dependences of the tunnel magnetoresistance are discussed. The Coulomb blockade and the improvement of the antiparallel alignment at low temperature both enhanced the TMR effects.
No takes yet. Share an insight, caveat, or question.
Fettar et al. (2002) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: